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Modeling of Rogowski Coils in RSCAD for Calibration Verification using RTDS

Klaehn Burkes Electrical Engineer

2nd Annual International Workshop on Grid Simulator Testing of Energy Systems and Wind Turbine Powertrains September 17-18, 2014

SRNL-L4500-2014-00079

SRNL’s High Current Lab – History

• Original high current standards from NIST • 100kA Weld Transformer • 10-100A Valhalla 2555A Current Amplifiers • 2 Machinable Rogowski Coils

• Range 100-100kA • 2 Jamb CT’s

• Range 10-1000A • New High Voltage Equipment

• Zimmer Power Analyzer • Zimmer 3-φ Voltage Transformer • Chroma High Voltage Supply

• 10kV-AC

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SRNL’s High Current Lab – Accountability

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Keep going for information on SRNL family colors.

SRNL’s High Current Lab – Calibration Equipment

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SRNL’s High Current Lab – Weld Transformer

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SRNL’s High Current Lab – Faraday Cage and Measurement Equipment

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SRNL’s High Current Lab – Machinable Rogowski Coil

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SRNL’s High Current Lab – Hardware in the Loop Equipment

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SRNL’s High Current Lab – Current Amplifiers

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SRNL’s High Current Lab – RTDS Equipment

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SRNL’s High Current Lab – Machinable Rogowski Coils and Current Transformers

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SRNL’s High Current Lab – Hardware in the Loop Equipment

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Machinable Rogowski Coil

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W

RSCAD Test System

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Harmonic Control of Amplifiers

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0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09

Comparison during Fault 0.35

0.3

0.25

0.2

Volta

ge (V

) 0.15

Rogoski Coil Model

Machinable Rogowski Coil 0.1

0.05

0 0.1

-0.05

-0.1 Time (sec)

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0.04 0.045 0.05 0.055

Comparison of Transient Response from a Increase in Amplitude

0.35

0.3

0.25

0.2

Volta

ge (V

) 0.15

Rogoski Coil Model

Machinable Rogowski Coil 0.1

0.05

0 0.035

-0.05

-0.1 Time (sec)

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100 Hz

60 Hz

0.02 0.03 0.04 0.05 0.06 0.07

Comparison of a Increase in Frequency

0.12

0.1

0.08

0.06

0.04

Volta

ge (V

)

Rogoski Coil Model

Machinable Rogowski Coil

0.02

0 0.01 0.08

-0.02

-0.04

-0.06

-0.08 Time (sec)

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0.035 0.04 0.045 0.05

Comparison of Transient Response from a Increase in Frequency

0.12

0.1

0.08

0.06

0.04

Volta

ge (V

)

Rogoski Coil Model

Machinable Rogowski Coil

0.02

0 0.03 0.055

-0.02

-0.04

-0.06

-0.08 Time (sec)

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0.04 0.05 0.06 0.07 0.08

Comparison of a Decrease in Frequency

0.06

0.04

0.02

0

Volta

ge (V

)

0.03 Rogoski Coil Model

Machinable Rogowski Coil -0.02

-0.04

-0.06

-0.08 Time (sec)

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0.065 0.07 0.075 0.08 0.085 0.09 0.095

Effect of 3rd Harmonic Injection 0.015

0.01

0.005

Volta

ge (V

)

Rogoski Coil Model 0 0.06 0.1 Machinable Rogowski Coil

-0.005

-0.01

-0.015 Time (sec)

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SRNL’s High Current Lab – Future Plans

• Continue with high current calibrations • Control the weld transformer with the RTDS • Create voltage calibration system with Chroma high voltage

supply and Zimmer PTs • Create a power system calibration system ISO17025 which is

mobile in the field with Zimmer power analyzer • Work with wind turbine manufactures and other industries to

preform high current/voltage calibrations

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High Current Lab – High Voltage Source and Power Analyzer

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Questions?

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